springboot 攔截器

1.建立攔截器（如token驗證攔截器）

package com.antong.api.interceptor;

import java.lang.reflect.Method;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import com.antong.common.exception.AuthException;
import com.antong.common.jwt.JwtManager;

/**   
 * Copyright: Copyright (c) 2018 zq_tuo
 * 
 * @ClassName: AuthenticationInterceptor.java
 * @Description: Token驗證過濾器,判斷是否已登陸以及權限驗證
 * @version: v1.0.0
 * @author: tuozq
 * @date: 2018年6月27日 上午10:43:06 
 * Modification History:
 * Date         Author          Version            Description
 *---------------------------------------------------------*
 * 2018年6月27日     tuozq           v1.0.0               修改緣由
 */
public class AuthenticationInterceptor implements HandlerInterceptor {

	public final static String ACCESS_TOKEN = "token";

	/* (non-Javadoc)
	 * @see org.springframework.web.servlet.HandlerInterceptor#preHandle(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse, java.lang.Object)
	 * 在請求處理以前進行調用（Controller方法調用以前）
	 */
	@Override
	public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
			throws Exception {
		// TODO Auto-generated method stub
		// 若是不是映射到方法直接經過
		if (!(handler instanceof HandlerMethod)) {
			return true;
		}
		System.out.println(request.getRequestURI());
		HandlerMethod handlerMethod = (HandlerMethod) handler;
		Method method = handlerMethod.getMethod();
		// 判斷是否存在令牌信息，若是存在，則容許登陸
		String accessToken = request.getParameter(ACCESS_TOKEN);
		if (null == accessToken) {
			throw new AuthException("401", "無token，請從新登陸");
		}
		JwtManager.me().verifyJwtToken(accessToken);
		// 當前登陸用戶@CurrentUser
		//request.setAttribute(CurrentUserConstants.CURRENT_USER, user);
		return true;
	}

	/* (non-Javadoc)
	 * @see org.springframework.web.servlet.HandlerInterceptor#postHandle(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse, java.lang.Object, org.springframework.web.servlet.ModelAndView)
	 * 請求處理以後進行調用，可是在視圖被渲染以前（Controller方法調用以後）
	 */
	@Override
	public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
			ModelAndView modelAndView) throws Exception {
		// TODO Auto-generated method stub

	}

	/* (non-Javadoc)
	 * @see org.springframework.web.servlet.HandlerInterceptor#afterCompletion(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse, java.lang.Object, java.lang.Exception)
	 * 在整個請求結束以後被調用，也就是在DispatcherServlet 渲染了對應的視圖以後執行（主要是用於進行資源清理工做）
	 */
	@Override
	public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)
			throws Exception {
		// TODO Auto-generated method stub

	}

}

2. 配置攔截器 攔截哪些請求 

package com.antong.api.config.spring;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;

import com.antong.api.interceptor.AuthenticationInterceptor;

/**   
 * Copyright: Copyright (c) 2018 zq_tuo
 * 
 * @ClassName: WebMvcConfigurer.java
 * @Description: mvc配置
 * @version: v1.0.0
 * @author: tuozq
 * @date: 2018年6月27日 上午10:46:34 
 * Modification History:
 * Date         Author          Version            Description
 *---------------------------------------------------------*
 * 2018年6月27日     tuozq           v1.0.0               修改緣由
 */

@Configuration
public class WebMvcConfig extends WebMvcConfigurerAdapter {

	@Override
	public void addInterceptors(InterceptorRegistry registry) {
		// token權限攔截器
		registry.addInterceptor(authenticationInterceptor()).addPathPatterns("/**")
		.excludePathPatterns(
				"/api/user/doLogin", //登陸請求不進行攔截
				"/swagger-resources", "/v2/api-docs", "/configuration/**" //swagger2相關請求不攔截
		);
		super.addInterceptors(registry);
	}
	
	/**
	 * 全局token權限攔截器
	 * @return
	 */
	@Bean
	public AuthenticationInterceptor authenticationInterceptor() {
		return new AuthenticationInterceptor();
	}

}